O le eletise tu'ufa'atasiga tu'ufa'atasiga e faia i le tele-layer composite o le fa'apipi'i maualuga-vevela fa'apipi'iina i le polyester film.O loʻo i ai mea faʻainisinia lelei, mea eletise, faʻaitiitia, hygroscopicity ma faʻalagolago i le vevela.E masani ona faʻaaogaina mo transformer mago maualuga ma maualalo voltage.Insulation i le va o coils, e mafai ona faʻaaogaina e avea o se faʻamau faʻamaʻi ma faʻamavae faʻaiʻu nai lo le epoxy resin laupapa, phenolic resin laupapa.
